Definition: | complex quantity appearing in the complex representation of a wave , where its real part represents, along a line parallel to the x-axis, a characteristic quantity of a guided sinusoidal wave or a plane sinusoidal wave, at angular frequency ω and initial phase NOTE 1 The concept of propagation coefficient has a meaning only when and are substantially independent of x. NOTE 2 The propagation coefficient has the dimension of reciprocal length and is usually a function of frequency.
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